Cutter-head.



G. A. ENSIGN.

CUTTER HEAD.

APPLICATION FILED MAYIO, 1913.

1,072,930, V Patented Sept. 9, 1913.-

WITNESSES INVENTOH N g/z w w 660/56 7252 1;

ATTORNEYS COLUMBIA PLANOGRAPH C0.. WASHINGTON D c 4 ca rn-n sra'rss rarmwr series.

.eEoRe-E A. ENSIGN, or DEFIANCE, 01110, ASSIGNOB TO DEFENCE MACHINE worms,

' 01 DEFIANOE, OHIO.

by clamping screws, or, as the result of removed clamping screws.

In order to accomplish the desired result, use is made of a hub provided on its peripheral face with a series of undercut grooves extending parallel to the axis of the hub, the bit holders having-bases slidingly engaging the said grooves, each base being provided with clamping members, and a set,

screw engaging the clamping members of a base to draw the clamping members into clamping contact with the walls of the groove.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is an elevation of one end of the cutter head with one of the holders in position; Fig. 2 is a side elevation of the same with part in section, on the line 22 of Fig. 1; Fig. 3 is a plan view of one of the bit holders; Fig. fl: is a perspective view of the same; Fig. 5 is an elevation of one end of the cutter head provided with an undercut groove in the form of a dovetail; and Fig. 6 is a perspective View of the bit holder for the cutter head shown in Fig. 5.

The hub A of the cutter head is provided with the usual bore B adapted to engage a driving shaft or a spindle to which the hub A is secured by'one or more set screws C or other suitable fastening devices. The hub A is provided on its peripheral face with a series of undercut grooves D extending parallel to the axis of the hub A. The undercut grooves D, as shown in Fig. 1, are in the form of T slots, and as shown in Fig. 5 the undercut grooves D are in the form of dovetail grooves, but I do not limit H Specification of Letters Patent. Application filed May 10, 1913. Serial No. 766,785.

CUTTER-HEAD.

Patented Sept.9,1913.

of which the bottom member E fits into the undercut groove D while the top or outer member E fitsonto flattened bearing surfaces F arranged on the peripheral face of the hub A adjacent to the sides of the groove D. The base Eis provided with a split E extendingfrom one end of the base E to within a distance of the other end thereof and extending between the top of the memher-E and the bottom of the member E and the said members E E are engaged at the split portions by a screw G for drawing the split portions of the clamping members E and E toward each other. In doing so the clamping member is drawn into firm contact with the undercut portions of the grooves D, while the other clamping member E is drawn into firm contact with the bearing faces F and consequently the base is firmly clamped in position on the hub A, thus holding the bit holder securely in adjusted position.

It is understood that the screw G passes loosely through the top clamping members E and screws into the bottom clamping member E without moving in cont-act with the bottom of the corresponding undercut groove D, so that the said bottom is not liable to be marred by contact with the screwas is the case with adjustable bit holders now generally used and fastened in place by set screws.

It will be noticed that by the arrangement described the split portions or clamping members of the base E provide four contact faces for engagement with the corresponding faces on the hub A, so that the bit holder can be securely fastened in position on the hub A.

It is further understood that when the screw E is partly unscrewed the bit holder can be readily shifted lengthwise on the hub A until the desired position is reached, then the screw G is screwed up to fasten the bit holder in place, as above explained.

It is understood that the bit holder E and its base E are made from a single piece of metal.

It will also be noticed that by the arrange ment described, the hub A is not liable to be unduly strained when mounting a number of bit holders E in place on the hub A. V

The split E" and screw G are preferably arranged in'the rear of the bit holder E'so that the latter extends mainly from the solid portion of the base E.

The forward face of the bit holder E, onto which the bit orblade is fastened, preferably extends in a plane intersecting the axis of the hub at about an angle of 4:5" so that the transverse strain incident to cutting the workis mainly :on the forward solid or nonsplit portion of the base E not on the rear split, portion of the base so thatthe clamping contact of the split base portion with the hub A is not interfered with and the bit holder is not liable to work loose during the use: of the cutter head.

I-lav1ng thus descrlbed ,my lnvention, I claim as new and deslre to secure by Letters Patent: 1

1. Aout-ter head, comprising a hub provided on its peripheral face with a series of guideways extending parallel with the axis of the hub, bit holders having bases, each base having an inner clamping member and an outer clamping member, of which the inner clamping member fits into the guideway and the outer clamping member engages the peripheral face of the hub at the sides of the guideway, the said base having a split intermediate the said clamping members, and the latter bemg integral at the base and a screw engaging the sa d clamping membersto draw the same toward each other, and in engagement with the sides of the guideway and the face ofthe hubr 2. A cutter head, oomprisin a hub provided on its peripheral face with anun'der cut groove, a bit holder having a base provided with integral clamping members and a splitextending between the clamping mem- V bers from one end of the base to within a distance of the other end of the base, one of the clamping members fitting into the said undercut groove and the other clamping member engaging the peripheral face of the bers of which one fits into the sai undelc lfi V groove and the other engages the saidbearing surfaces, the said base being providt with asplit extending between the sa d members and from oneend Qf'thflbaSetQ within a distance of the other'end of the base, and a screw engaging the mem here at the split.

two subscribing witnesses.

, WVitnesses: V r.

GERALD DE VEAUX, F. E. HALL.

GEORGE A, Easier. 7

Copies of this patent may be obtained for five cents each, by addres ing the "fiommissioner 0i IMQBJS, V

Washingto p v In testimony whereof have signed my name to this specification in the presence of 

